Specify the GIT_EMAIL and GIT_NAME variables for this to work. They are used to set up git correctly and allow the following commands to work.
To push code changes made within the container back to git run:
sudo docker exec -t -i <CONTAINER_NAME> /usr/bin/push
In order to refresh the code in a container and pull newer code from git run:
sudo docker exec -t -i <CONTAINER_NAME> /usr/bin/pull